Pulsed Infrared Transmitter (CB20981E)

Found in old American documentation, this circuit is current as it uses the 555 to modulate an infrared LED. Pulses are set by R1.

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Car Power Amplifier (CB17259E)
This power amplifier configuration can be used in a public address system (ads) in the car. The...
Low current in the dark light sensor (CB8311E)
This circuit was found in Philips documentation from 1967. The phototransistor is from that time,...
Bipolar Transistor Colpitts Oscillator (CB4582E)
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...